Two-stroke-cycle internal-combustion engine



L. V. THOMAS.

Two-STROKE CYCLE INTERNAL4 CoMBusTloN ENGINE.

APPLICATION FILED IULY8| 1919.

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f W1' @f2/wien' Patented J an. 3, 1922.

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L. V. THOMAS.

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L. V. THOMAS.

Two-STROKE cYcLE INTERNAL coNBusTloN ENGINE.

APPLICATION FILED JULY 8,1919.

L. V. THOMAS. -'TWO-.STROKE CYCLE INTERNAL COMBUSTION ENGINE.

APPLICATION FILED IuLY 8. 1919.

1,402,683, Patented Jan. 3,1922.

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foUrsfvrcTonTHoMAs, or LYON, TRANCE, nssicfNoia To LA socinTnANoNYiun DUMOTEUR L. THOMAS, or LYON, FRANCE.

Two-.sTRoKn-OYOLE iNTEnNALcoMBUsTION ENGINE.

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Application filed .'ulv 8, 1919. Serial No. 309,328.

To aZZ whomz't may concern:

Be it known that I, Louis VICTOR THOMAS, a citizen of the FrenchRepublic, of Lyon, France, have invented certain new and usefulImprovements in Two-Strolre-Cycle nternalombustion Engines, of which thefollowing is a specification.

rrEhe present rinvention consists in a two- 'stroke' cycle internalcombustion engine wherein the distribution is effected by means of areciprocating slide valve, which is actuated by the motorfshaft and maybe asso'- ciated with gear for actuating a magneto.

The invention isillustrated in the accompanying drawing', which shows byway of example, one form of construction of the motor.

Fig. l is an elevation partly in section on h line 1--1 of Fig. 4.Y

Fig. 2 isa section on line 2-2 of Fig. 1. Fig. 3 is a section on line 33 of Fig. 2. Fig. et is a section on line 4 4 of Fig. 1. ,a al designatethe cylinders, each communicating by Vmeans of ports b and c with a boxal at oneside of the cylinders. The box d contains a gas chamber` m anda cylindrical valve chamber 8 for the slide valve, the

' chamber 8 having near its ends ports 7 Opening into the chamber m. Thevalve is composed of a tubular body e closed at its ends by covers fflwhich hold in place the packing rings g g1. Inside the valve, at itslower central part, there is a boss `L into which is fitted the conicalhead c' of a driver j, iiXed by a nut c.' At its upper part the valvehas a large port Z for suction from the carburetter, andthe valve alsohas near its ends two ports a, nl, which alternately allow suction ofthe gases into the pump chambers of the cylinders through ports orchannels 0, o1.

For reciprocating the valve, ythe rod j is pivoted at jl to the rod p ofan eccentric Q, which receives its movement from the motor shaft 1" bymeans of worm wheels .s and t. The shaft u, which carries `the wormwheel t,

also carries a worm wheel o, which by means of wheelsm and y, actuatesthe shaft e of the magneto for ignition.

The carburetter is mounted on a union 6 above the valve, whichfacilitates the suction. j c

Each cylinder a or al comprises an upper `portion a2 of a smallerdiameter and a lowerA `portion a3. The piston portions 2 and 5 are.integral with one another. The port c opens into the larger diameter ,a3of the cylinder which therefore, on the descent of the piston, forms apump aspirating through port c and on the upstroke of the piston forcingthe aspirated mixture offair and fuel back through the same port c.

During the downward strokeof one ofthe pilstons, say the one on theright in Fig. 2, t e F ig. 3, through which is effected the exhaust ofthe gases of combustion. At the same time the port b is uncovered, andfresheX- plosive mixture stored under pressure in the chamber m entersythe cylinder, toward ythe top of which it is directed by the deflector4:,

and then descends alongvthe opposite wall sweeping' before it theresidual products of combustion. When the piston has reached the bottomof its stroke the cylinder is, thereber 5, joined to the part 2, anddescending at i the same time, sucks gas from the carburetter throughthe union 6 and the ports nl, 01 and c. The valve movement is thenreversed, and the ports nl and o1 are brought out of specification orretraitement. f Dm-@need .rama 1922, n

part 2 thereof uncovers the port 3, see

register. At this moment the piston is at its i lower dead point. Whenit begins its up`- ward stroke, the port 7 is uncovered,plac ing thechamber 8 in communication with the chamber m. lThe fresh fuel sucked inby the descent ofthe piston `5 is thus forced during the upward strokeof the piston through the port c into the chamber m, from which it willpass into the cylinder a.

Asimilar cycle of operations takes placevfor f the cylinder on the left,but withv a phase difference of 180. Y

What 1 claim as my invention and desire to secure by Letters Patent ofthe 'United States -is y In a two stroke cycle internal combustionengine, the combination of two cylinders, each having an explosionVchamber and a pump chamber, and each explosion chamber having an inletport, a gas chamber open to said inlet. ports,- a. slide valve chamberhevolm-Inloeie,v .sind to'withdraw the valve from 10 ing near each eneltwo ports, .one operi to the the last mentioned ports. gag chamber andone open to one of the n Witness whereof I haveA signed this pumpchambers, a liollovil slide valve in said speeieaton in the presence oftwo -Witvalve chamber having 2m `elongated ges in# nesses.

let port and having also near each end a gas LOUISA VICTOR THOMAS. Youtlet port, and means for reciprocating seid` Y Witnesses: i. l i Valveto place itsV outlet ports alternately iii JEAN GERMAIN,

register with the two ports open to the'pump RICHARD C. (nrEoRGEs. e

